Polymers
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2018
·Vol. 10
·期 5
·495
·
IF 2.935
Jianhua Ran,Mantang He,Wenbin Li,Deshan Cheng,Xin Wang
This work aims to develop durable functional cotton fabrics by growing zinc oxide (ZnO) nanoparticles on polydopamine (PDA) templates. ZnO nanoparticles were grown on the PDA-templated cotton fabrics by the hydrothermal method at room temperature. The surface morphology, chemical composition, and crystalline structure of the ZnO-coated cotton fabrics were characterized by scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The ZnO nanoparticles were found to disperse evenly on the surface of cotton fabrics. The ultraviolet (UV) protection factor (UPF) value of the ZnO-coated cotton fabrics was maintained at 122.5, and 99% reduction in bacterial load was observed againstGluconobacter cerinuseven after five cycles of laundering. The PDA was found to be effective in fixing the ZnO seeds tightly on the surface of cotton fabrics, resulting in excellent durability of the coating of ZnO nanoparticles.Keywords:ZnO nanoparticles;polydopamine;cotton fabrics;antimicrobial;UV protection
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Weiwei Tie,Zhao Zheng,Chao Xu,Zhi Zheng,Surjya Sarathi Bhattacharyya,Weiwei He,Seung Hee Lee
Utilizing a one-pot solvothermal procedure novel one-dimensional zinc oxide–carbon nanotube nanohybrids (ZnCT) were synthesized in alcohol-alkali solution, free of catalytic assistance. The ZnCT hybrids were prepared through covalent modification of zinc oxide nanorods (ZnO NRs) with functionalized carbon nanotubes (f-CNTs). The morphology and microstructure of as-prepared ZnCT hybrids were characterized by scanning electron microscopy (SEM), powder X-ray diffraction, Raman, X-ray photoelectron and UV–vis absorption spectroscopies. SEM images of the ZnCT hybrids indicated that the ZnO ethanol NRs grew longer along the vertical radial (0 0 0 1) surface and aggregated to a lesser extent than the analogous ZnO methanol NRs. Photodegradation analysis showed that the off-white ZnCT ethanol hybrid with ascendant UV–visible light absorption had displayed superior photocatalytic activity towards Rhodamine B (RhB) dyes than either pure ZnO ethanol , ZnO methanol NRs or ZnCT methanol hybrid, among which the photocatalytic activity of ZnO ethanol NRs was better than that of ZnO methanol NRs. Raman and X-ray photoelectron spectroscopy analyses confirmed a strong interaction between f-CNTs and ZnO ethanol NRs in ZnCT ethanol hybrid, in which Zn ions were chemically bonded to negatively charged oxygen-containing groups at the graphene-like surface of f-CNTs. The enhanced separation lifetime of the photogenerated electron-hole observed by surface photovoltage and photocurrent measurements of the ZnCT ethanol hybrid was attributed to the efficient covalent linking of Zn O C and close contact configuration between the f-CNTs and ZnO ethanol NRs. Further controlled photodegradation and electron spin resonance (ESR) analyses revealed that the photodegradation of RhB dyes resulted from photogenerated holes, and radical species, such as O 2− , OH − , which were formed in-situ . Details of the photocatalytic mechanism were also explored herein.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Pan Li,Tao He
Inspired by the nature photosynthesis, fabrication of Z-scheme system is an effective strategy to enhance the photocatalytic activity, via which photogenerated electrons and holes that take part in the redox reactions can be separated spatially and temporally, while their strong redox capability can still be preserved. It is of great importance to construct good Z-scheme demo systems, and yet a considerable challenge to verify the charge transfer direction, which is vital for designing and fabricating the photocatalytic systems with high efficiency. Here ZnS@ZnO core-shell nanostructures were fabricated via simply annealing ZnS(en) 0.5 precursor, which exhibited superior activity for solar fuel production to ZnS. The Z-scheme mechanism was proposed based on the experimental results of charge transfer study. Direct intimate contact is formed at interface due to in-situ growth with common Zn cation. Specifically, ZnS X O 1–X and/or defects may be formed at the interface, which behave like a mediator in a Z-scheme system. All these account for the observed efficient separation of charge carriers and enhanced activity of photocatalytic reduction.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 25
·6529-6538
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IF 3.307
Han Zhizhong,Luo Min,Weng Qinghua,Chen Li,Chen Jinghua,Li Chunyan,Zhou Ying,Wang Long
A highly sensitive and selective photoelectrochemical (PEC) aptasensor was constructed for carcinoembryonic antigen (CEA) detection based on ZnO flower-rods (ZnO FRs) modified with g-C 3 N 4 -Au nanoparticle (AuNP) nanohybrids. The nanohybrids of g-C 3 N 4 -AuNPs can improve the visible light absorbance of ZnO FRs and enhance the PEC property. We designed a sandwichlike structure formed with DNA hybridization of NH 2 -probe1, CEA aptamer, and CuS-NH 2 -probe2 to detect CEA. The p -type semiconductor CuS nanocrystals (NCs) at the terminational part of sandwichlike structure work as electron traps to capture photogenerated electrons and consequently lead to a magnified photocurrent change. The results indicate that the photocurrent is increased when CEA antigen (Ag) is introduced. Since the sandwichlike structure is destroyed, CuS NCs are restricted to capture photogenerated electron. The PEC aptasensor for CEA determination is ranged from 0.01 ng·mL −1 to 2.5 ng·mL −1 with a detection of 1.9 pg·mL −1 . The proposed aptasensor exhibits satisfactory PEC performances with rapid detection, great sensitivity and specificity. Specially, this PEC aptasensor shows a reliable result for the determination of CEA in invalid human serum compared with the ELISA method. The designed aptasensor may provide a new idea for a versatile PEC platform to determine various molecules.
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Nanoscale
·
2018
·Vol. 10
·期 15
·7155-7162
·
IF 7.233
Kai-Kai Liu,Xiao-Ming Li,Shao-Bo Cheng,Rui Zhou,Ya-Chuan Liang,Lin Dong,Chong-Xin Shan,Hai-Bo Zeng,De-Zhen Shen
Aggregation-induced quenching (ACQ) in carbon nanodots (CNDs) impede their applications in solid devices. Herein, the concept of alternating quantum dot (QD) chains was proposed to overcome the common issue of fluorescence quenching in CNDs; in this study, CNDs and ZnO QDs were interlinked to form carbon-ZnO alternating quantum dot chains (CZA-QDCs), which overcame the ACQ of CNDs and hence ensured efficient full-spectrum fluorescence for white light-emitting devices (WLEDs) without excessive blue emission. Under the excitation of 365 nm lines, white emission resulting from the combination of blue emission from the CNDs and yellow emission from the ZnO QDs has been achieved from these powders. The quantum efficiency of the CZA-QDC powders can reach 49% and remain stable for two months. By coating the powders onto an ultraviolet chip as phosphors, WLEDs with a luminous efficiency of 20.1 lm W−1, color coordinate of (0.30, 0.35), correlated color temperature of 5205 K, and a color rendering index of 84 have been fabricated. Due to the relatively high abundance and eco-friendly characteristics of both carbon and ZnO, the results reported herein may provide a promising alternative to fluorescent phosphors that are widely used in WLEDs.
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Plasmonics
·
2013
·Vol. 8
·期 2
·1193-1202
·
IF 2.425
Han Zhizhong,Wei Liyuan,Zhang Zhankun,Zhang Xinqi,Pan Haibo,Chen Jianzhong
The semiconductor metal oxide, ZnO, is limited to application in photocatalysis because of large bandgap. Metallic nanostructures are utilized to enhance visible-light absorption and improve photocatalytic activity via surface plasmon resonance (SPR). In this work, through a facile thermal decomposition method, the Au nanoparticles (NPs) were successfully loaded on oriented hierarchical ZnO flower-rod (ZFRs) heterostructures, which have a higher areal proportion of exposed active (001) crystal faces. The results indicate that ZFRs are wurtzite phase grown along the [001] direction and the Au NPs spread on the surface of ZFRs in metallic form. It reveals that there is an electronic interaction between Au NPs and ZFRs, and more oxygen molecules are adsorbed on the surface of Au-ZnO flower-rod heterostructures (AZFRs). The AZFRs show a strong absorbance in visible region due to the SPR and enhance the separation of electron–hole pair, resulting in an improvement of photocatalytic activity under visible-light irradiation. During 80 min, the degradation efficiency of rhodamine B for AZFRs-20 is about 3.7 times as the pure ZFRs. Moreover, the AZFRs exhibit predominant photoelectrochemical properties, and the photocurrent can reach 1.2 × 10 −4 A. Finally, the as-prepared photocatalytic device composed of AZFRs based on indium doped tin oxide glass is convenient to recycle without centrifugation.
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MATERIALS & DESIGN
·
2015
·
IF 3.501
Chen Hao,Yinglu Yang,Yuru Shen,Feng Feng,Xiaohong Wang,Yutao Zhao,Cunwang Ge
The graphene (G)–ZnO (G–ZnO) nanocomposites with high photocatalytic activity have been successfully prepared by a simple and inexpensive liquid phase-based ultrasonic-assisted method with different doping amounts of graphene oxide . The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy , UV–visible diffuse reflectance spectroscopy (UV–vis/DRS) and Brunauer–Emmett–Teller (BET) analysis. The results indicate that the assistance of ultrasonic can effectively decrease the size of ZnO nanostructure and increase the uniformity of the mixture of graphene and ZnO particles. Meanwhile, the sunlight absorption of the G–ZnO nanocomposite is gradually improving with the increase of the ratio of graphene. The obtained G–ZnO-30 photocatalyst shows the best photocatalytic activity for methylene blue (MB) and methyl orange (MO) under sunlight irradiation. The degradation rates of MB and MO in the presence of G–ZnO-30 reached up to 98.1% and 95.7%, respectively, under solar radiation for 1 h and 6 h. In addition, the photocatalyst exhibits outstanding separability and high stability.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Long Zhang,Lianhuan Du,Xiang Yu,Shaozao Tan,Xiang Cai,Peihua Yang,Yu Gu,Wenjie Mai
Electron–hole recombination is one of the major factors limiting the efficiency of ZnO-based photocatalysts. In this work, a 2-fold enhancement strategy was employed to suppress electron–hole recombination and boost photocatalytic efficiency. First, significantly enhanced photocatalytic activity of ZnO by introducing graphene oxide (GO) was systematically investigated. Hybrid photocatalysts with different weight ratios of ZnO to GO (from 0.95:0.05 to 0.70:0.30) were synthesized and characterized. The results indicated that when the proportion ratio of ZnO to GO reached 0.85:0.15, the as-synthesized ZnO–GO nanocomposite exhibited the maximum photocatalytic efficiency on methylene blue with an apparent rate constant κapp almost 10 times faster than that of pure ZnO under UV illumination. GO was suggested to enhance the photocatalytic activity of ZnO because of its great capability in dye adsorption and charge separation. Second, Pd nanoparticles were introduced to decorate ZnO–GO to produce generally better photocatalyst ZnO–GO–Pd nanocomposites. The junction between Pd and ZnO was believed to also effectively separate the photogenerated charges due to the metal-semiconductor diode effect. These two systems of ZnO–GO and ZnO–GO–Pd nanocomposites are expected to have a broad range of applications in environmental conservation.
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Nanoscale
·
2013
·Vol. 5
·期 23
·11808-11819
·
IF 6.233
Yun Yang,Shuhua Han,Guangju Zhou,Lijie Zhang,Xingliang Li,Chao Zou,Shaoming Huang
We present a general route for synthesizing M@ZnO nanoparticles (NPs) by using ascorbic acid (AA) to induce deposition of ZnO on various shaped and structured cationic-surfactant-capped NP surfaces (noble, magnetic, semiconductor, rod-like, spherical, cubic, dendrite, alloy, core@shell). The results show that the complexing (AA and Zn2+) and cooperative effects (AA and CTAB) play important roles in the formation of polycrystalline ZnO shells. Besides, the growth kinetics of M@ZnO was systematically studied. It was found that the slow growth rate favors the successful formation of uniform core@ZnO NPs with relatively loose shells. An appropriate growth rate allows achieving high quality M@ZnO NPs with dense shells. However, very fast growth causes significant additional nucleation and the formation of pure ZnO NPs. This general method is suitable for preparing M@ZnO using seed NPs prepared in both water and organic phases. It might be an alternative route for functionalizing NPs for bioapplications (ZnO is biocompatible), modulating material properties as designed, or synthesizing template materials for building other nanostructures.
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ELECTROANALYSIS
·
2015
·Vol. 27
·期 6
·1490-1497
·
IF 2.138
Jiapeng Fu,Zengyuan Pang,Jie Yang,Zhanping Yang,Jianhua Cao,Yang Xu,Fenglin Huang,Qufu Wei
We fabricated a novel hierarchical composite mat composed of electrospun cellulose nanofibers decorated with Ag-doped ZnO (Ag-ZnO) nanoparticles and further demonstrated its potential application as the efficient laccase (Lac) biosensor substrate material. The cyclic voltammograms revealed that the Ag-ZnO/cellulose nanofibrous mat provided an excellent microenvironment for Lac immobilization and benefited direct electron transfer of Lac. The fabricated Lac/Ag-ZnO/cellulose/GCE exhibited a highly sensitive detection of catechol with a wide linear range from 0.995 to 811 µM and a low detection limit of 0.205 µM. The results indicated that Ag-ZnO/cellulose nanofibers were the promising nanostructured materials for the construction of different biosensors.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Zhihua Wang,Jie Xue,Dongmei Han,Fubo Gu
ZnO nanopyramids (NPys) with exposed crystal facets of {101̅1} were synthesized via a one-step solvothermal method, having a uniform size with a hexagonal edge length of ∼100 nm and a height of ∼200 nm. Technologies of XRD, TEM, HRTEM, Raman, PL, and XPS were used to characterize the morphological and structural properties of the products, while the corresponding gas sensing properties were determined by using ethanol as the target gas. For the overall goal of defect engineering, the effect of aging temperature on the gas sensing performance of the ZnO NPys was studied. The test results showed that, at the aging temperature of 300 °C, the gas sensing property has been improved to the best, with the fast response-recovery time and the excellent selectivity, because the ZnO300 has the most electron donors for absorbing the largest content of O2–. Model of defect redistribution was used to explicate the changing of the surface defects at different aging temperatures. The findings showed that, in addition to VO, Zni was the dominant defect of the {101̅1} crystal facet. The gas sensing performance of the ZnO NPys was determined by the contents of VO and Zni, with all of the defects redistributed on the surface. All of the results will be noticeable for the improvement of the sensing performance of materials with special crystal facet exposing.
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RSC Advances
·
2017
·Vol. 7
·期 79
·50064-50071
·
IF 3.108
Shengzhe Zhao,Zhiqiang Cheng,Lijuan Kang,Mingtang Li,Zhiling Gao
Hollow TiO2 and TiO2/ZnO nanotubes were produced using a simple and novel approach combining electrospinning with an impregnation calcination method. Using a photoreduction method, silver nanoparticles (AgNps) were successfully decorated on the surface of nanotubes. During the synthesis process, the electrospinning procedure provided sacrificial templates for the fabrication of hollow nanotubes by producing PAN nanofibers, which can be immobilized on the TiO2 surface through a soaking method. Later, the composite nanofibers of TiO2/PAN were calcined into pure TiO2 nanotubes after complete combustion of the sacrificial templates. The morphology of the samples was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and components of the samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). Upon blending ZnO into TiO2, a new crystallite ZnTiO3 was formed in addition to the ZnO and TiO2 crystallites, and the ultra-violet light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic properties were evaluated using the degradation of methyl orange (MO) dye. As observed from the results, the Ag/TiO2/ZnO nanotubes could degrade MO efficiently under UV irradiation, which showed excellent photocatalytic activity compared to pure TiO2. The synthetic mechanism of Ag/TiO2/ZnO nanotubes and the mechanism for the enhanced photocatalytic activity have been proposed.
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